app2app communication toolkit

[1000TurquoisePogs]

• users dont know what apps can currently do, because nothing is cataloging capabilities, and many apps that do have app2app arent doing it in a formal way that could be cataloged, even though app2app v2 can do that... most are app2app v1 currently.

  • can a user make custom app2app actions by chaining together existing app2app features apps present. for example, you cant add an 'open dataset' action if the editor doesnt have one, but you could chain together 'open dataset' from 3270 to editor if both had app2app features that you could combine.

### Tasks
- [ ] https://github.com/zowe/zlux/issues/904
- [ ] https://github.com/zowe/zlux/issues/905

[github-actions[bot]]

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